aa
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AI In plain words
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AA¹
Where it comes from
Abbreviations.
noun AAs
- A member of Alcoholics Anonymous. In a letter to Cohen, written between 1956 and 1961, he reported hearing gossip about his LSD use in AA circles. He reminded Cohen about "the desirability" of omitting his name "when discussing LSD with AAs". Cohen reassured Wilson that his LSD trials did not include other active AA members.
- An AA battery (energy-storage device). Whether your camera takes AAs or a unique, proprietary battery, you should always have a spare. […] You will not be able to walk into a local supermarket and buy a new one as you can with AAs.
- Initialism of affirmative action Some of the rules guiding these nominations are affirmative action (AA)¹ policies intended to increase the influence of and to encourage nomination of women and minorities. […] A review of the extant literature on AA and its effect on decision-makers produces competing hypotheses about the potential i
- Initialism of air armament
- Initialism of air attaché
- Initialism of aircraft apprentice
- Initialism of aircraft artificer
- Initialism of absolute altitude
- Initialism of anti-aircraft They're setting up an AA battery. That thing'll tear the Dawn apart... We'll wait for you to take the shot.
- Initialism of avenue of approach
- Initialism of assembly area
- Initialism of airman apprentice
- Initialism of absolute alcohol
- Initialism of achievement age
- Initialism of acting appointment
- Initialism of adoption agency
- Initialism of armament artificer
- Initialism of athletic association
- Initialism of author's alteration
- Initialism of aviation annex
- Initialism of angular aperture
- Initialism of amino acid All proteinogenic amino acids (AAs) are claimed to be levorotatory (L-configured). Nevertheless, dextrorotatory AAs (D-configured) are also found in nature (Gao et al., 2015; Ollivaux et al., 2014), for example, in the organic material of extraterrestrial comets (Cronin and Pizzarello, 1983), or, fo
- Initialism of aminoacyl
- Initialism of acetic acid
- Initialism of acrylic acid For copolymers of ethylene, the other comonomer can be an alkene such as propene, butene, hexene or octene, or a compound having a polar functional group such as vinyl acetate (VA), acrylic acid (AA), ethyl acetate (EA), methyl acrylate (MA) or vinyl alcohol (VOH).
- Initialism of amyloid A
- Initialism of arachidonic acid Arachidonic acid (AA) is present at unusually high levels in the phospholipids of inflammatory cells. […] IgG-mediated phagocytosis results in the preferential release of AA over other fatty acids²³ via activation of cPLA₂ and iPLA₂.
- Initialism of ascorbic acid
- Initialism of asymmetric aminohydroxylation
- Initialism of acetaldehyde adduct The two tests presently in this category are the blood tests carbohydrate deficient transferrin (CDT) and hemoglobin or whole blood acetaldehyde adducts (AA). […] Measurement of AA in the blood has also generated a great deal of recent research interest.
- Initialism of adrenal androgen Although the ovaries are the main source of androgen excess in PCOS, excess adrenal androgen (AA) levels (e.g., dehydroepiandrosterone [DHEA] and adrenal-secreted androsteredione [A4]) and adrenocortical dysfunction have also been observed in many patients with PCOS (2–6). Proof of the role of AA ex
- Initialism of antiandrogen
- Initialism of antioxidant activity Antioxidant activity (AA) is one of the main and most acclaimed properties of edible oil, and the antioxidant properties of EVOO have been extensively highlighted (Tuck and Hayball, 2002; Vissers et al., 2004). AA is usually estimated by monitoring the scavenging of a free radical by antioxidants th
- Initialism of atomic absorption
- Initialism of activated alumina Activated alumina (AA, or γ-Al₂O₃) is an amorphous aluminium oxide prepared by dehydrating Al(OH)₃ at high temperature, […] Arsenic removal on AA is strongly pH-dependent, and is optimal between pH 5.5 and 6.0, which often requires acidification, and subsequent neutralisation to prevent corrosion.
- Initialism of anti-antibody
- Initialism of ascending aorta
- Initialism of abdominal aorta
- Initialism of aortic arch
- Initialism of acute appendicitis
- Initialism of allergic asthma
- Initialism of alopecia areata The existence of many autoimmune concurrent diseases supports that AA is an autoimmune disease. […] The incidence of type I diabetes in AA is intriguing; it is decreased in AA patients and increased in their relatives.
- Initialism of anaplastic astrocytoma
- Initialism of anastomotic aneurysm An anastomotic aneurysm (AA) is an aneurysm that occurs at an anastomotic interface between a graft and an artery. […] Recently, it has been recognized that an increasing number of AAs may in fact be true aneurysms occurring at the junction of a prosthetic graft and an artery.
- Initialism of aortic aneurysm This issue of Circulation has an interesting contribution from Reed et al,¹ who advance the point of view that aortic aneurysms (AAs) are “caused” by atherosclerosis. […] The authors propose two arguments in support of a “causal” relation between atherosclerotic risk factors and the development of A
- Initialism of aplastic anemia Aplastic anemia (AA) secondary to radiotherapy presents a difficult situation in the treatment of both the malignant tumor and AA itself. We aimed to evaluate the efficacy of avatrombopag (AVA), a thrombopoietin receptor agonist, in patients with AA secondary to chemoradiotherapy.
- Initialism of arterial aneurysm Arterial aneurysms (AA) are local out-pouching of a blood vessel wall. […] According to the statistics, 90% of all AA are located in the anterior segments of the circle of Willis and only 10% in the posterior segments (Dandy 1944; Zlotnik 1967).
- Initialism of arytenoid adduction If the paralysis is unilateral, arytenoid adduction (AA) procedures can be done to medialize the complex and arguably improve the results of an implant medialization.⁷⁹ An AA arytenopexy can reconfigure the ipsilateral arytenoid for improved glottic closure, if needed.^(1,80)
- Initialism of anesthesiologist assistant
- Initialism of anesthesia assistant
- Initialism of antialiasing
- Initialism of African-American For example, among AAs “spell” refers to a trance state in which individuals can communicate with deceased relatives and which is associated with brief periods of personality change (American Psychiatric Association 1994).
- Initialism of Asian-African
- Initialism of Asian American Asian Americans (AAs) constitute the fastest growing group in the United States, yet health promotion in this population is severely hampered by its invisibility in the U.S. population. […] This chapter will address each of the four factors that contribute to the lack of knowledge and health informa
- Initialism of administrative assistant But Wilson's loyal administrative assistant, Charlie Simpson, felt that he couldn't put up with it anymore. […] “I have to learn how to be a congressman and you need to learn how to be an AA [administrative assistant],” Wilson had told Simpson. “And this is the first thing we have to do.” […] The ex
- Initialism of associate administrator I've worked at NASA as a graduate student working as a summer intern, and as an AA. Those are two of the most valuable experiences in my life.
- Initialism of assistant adjutant
- Initialism of academic adviser The AA said that given my background in English studies and applied linguistics, my introductory course in phonetics would be waved. Three of the four courses the AA prescribed included computer assisted instruction, which I eventually dropped due to overload, English language teaching methodology a
- Initialism of Associate in Arts or Associate of Arts “I’m still figuring out my plans, but going back for another year is in my plans. I would be going back and getting my AA [degree], while playing another year of softball,” Enright said.
- Initialism of appropriate authority
proper noun
- Initialism of Alcoholics Anonymous: a self-supporting organization of alcoholic people. She said, “I'm an alcoholic, just like my mother was. It's a struggle, but I haven't had a drink in a while.” That was something she hadn't meant to say, something she had never said outside of an AA meeting. But, after it had been said, it felt like as good a way to start as any.
- Initialism of Academy Awards: a recognition of excellence in cinematic achievements, given annually by the Academy of Motion Picture Arts and Sciences. Like a true AA follower (as in Academy Awards, not 12 steps), I never cared for Oscar parties. Somebody always talked through the songs or Vanessa Redgrave's speech or the costume parade, in which elegant runway models were forced to dress up as the farmers in Places in the Heart.
- Initialism of Addicts Anonymous
- Initialism of Al Ain
- Initialism of American Airlines: a major American airline headquartered in Fort Worth, Texas. Alas, I fear, Netflix will soon break my heart. And it's an American icon that is warning me: American Airlines (AA). ¶ You see, middlemen are dying. Sabre, the former AA subsidiary that is now an independent global distribution system (GDS) supplying travel agencies and online travel agencies with
- Initialism of Aerolíneas Argentinas
- Initialism of Ansett Australia or Ansett Airways
- Initialism of Air Almanac, a publication.
- Initialism of American Anthropologist: the flagship journal of the American Anthropological Association, founded in 1888.
- Initialism of Acta Astronautica: a scientific journal founded in 1955, covering fields related to the peaceful scientific exploration of space.
- Initialism of Aluminum America, a corporation.
- Initialism of The Aluminum Association: a trade association for the aluminum production, fabrication and recycling industries.
- Double-A: the second-highest level of play in Minor League Baseball after Triple-A (AAA).
- Initialism of American Association: an American minor league baseball league from 1902 to 1962 and 1969 to 1997.
- Initialism of The Automobile Association: a British motoring association founded in 1905. As we have said before, never accept an AA increase – if you phone up and threaten to leave they will, in our experience, drop it back to the previous price. Or better still, just keep switching provider each year. LV’s cover is a good alternative.
- Initialism of Alzheimer's Association: an American volunteer health organization focusing on care, support and research for Alzheimer's disease.
- Initialism of Amalgamated Association of Iron and Steel Workers In the American steel industry, only two labor organizations were of any great significance in the late 19th and early 20th centuries. These were the Amalgamated Association of Iron, Steel and Tin Workers (The A.A.), and the Knights of Labor. The A.A. was formed in 1876 when the United Sons of Vulca
- Initialism of Ann Arbor Railroad
- Initialism of Arlington Annex
- USPS military code of Armed Forces – Americas. • APO/FPO AE ZIPs 094-098 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec.10 and Express Mail Military Service, Dec. 18. • APO/FPO AA ZIP 340 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec
- Initialism of Army Act
- Initialism of aviatsionnaya Armiya
- Initialism of Antiproton Accumulator: an infrastructure connected to the Proton–Antiproton Collider at CERN.
- Alternative form of A∴A∴ In Magic in Theory and Practice, Crowley explains his other Order, the Silver Star (Argentinum Astrum), which certainly does have such a degree. The AA is a totally secret occult organization in which any member should know only the person who initiated him or her and those whom he or she has initia
- Initialism of Anna's Archive This specific paper isn't available on AA, but to whom it may intrigue I think this works: […]
- Abbreviation of Alcoa Similarly, Alcoa (AA)CEO Klaus Kleinfeld has also dropped plans to attend, but the company will participate, said spokeswoman Monica Orbe.
adjective
- Initialism of anti-aircraft or anti-air.
- Initialism of air-to-air
- Initialism of atlantoaxial AA joint; AA instability
- Initialism of arterioarterial AA anastomosis
- Initialism of Afro-Asiatic
- Initialism of Austroasiatic
verb AAs · AAing · AAed
- Initialism of antialias On the other hand, edge AA in EF2000 didn't make much difference because only the objects were AAed and they made up only a very small percentage of the screen area.
aa²
- /ˈɑː.ɑː/ UK
- [ˈɑː.ʔɑː] UK
- /ˈɑ.ɑ/ US
- [ˈɑ.ʔɑ] US
noun a'a · 'a'a · 'a'ā · a-a · a aa · a-aa
- A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe. We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.
aa³
Where it comes from
Abbreviation.
noun
- Initialism of acetic acid
- Initialism of acting age
- Initialism of alveolar-arterial
- Initialism of aminoacetone
- Initialism of amino acid
- Initialism of approximate absolute
- Initialism of arachidonic acid
- Initialism of armature accelerator
- Initialism of ascending aorta
- Initialism of atomic absorption
- Initialism of author's alteration
- Initialism of average audience
adjective
- Initialism of arctic-alpine
- Initialism of always afloat
aa⁴
Where it comes from
Compare pp.
noun
- Abbreviation of adjectives
- Abbreviation of arteries
aa⁵
Where it comes from
Contraction.
adjective
- Abbreviation of ana (“of each, equal parts”).
aa⁶
pronoun
- I.
Aa⁷
Where it comes from
The river names are ostensibly from Proto-West Germanic *ahu (“river”).
proper noun
- A river in northern France, flowing 93 km from near Bourthes, Pas-de-Calais department into the North Sea near Gravelines, Nord department.
- A small river in the Netherlands, flowing 72 km from near Nederweert, Limburg into the Dieze at 's-Hertogenbosch, North Brabant.
- A tributary of the Möhne river in North Rhine-Westphalia, Germany, part of the Rhine basin.
- A tributary of the Nether river in North Rhine-Westphalia, Germany, part of the Weser basin.
- A tributary of the Werre river in North Rhine-Westphalia, Germany, part of the Weser basin.
- A village in Ida-Viru County, northern Estonia, on the Gulf of Finland.
- A surname from Norwegian.
Thesaurus
Closest in meaning: alcoholics anonymous, pdgf, trna, crystallin, helly, bb, lava, scoria, clinker, slag, basalt, pumice, cinders, rubble, breccia, detritus
Translations
Talk about this word "aa." Wiktionary, via Micwyn, micwyn.com/word/aa. Accessed 6 Nov. 2026. aa. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/aa "aa." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/aa.
Cite this
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BibTeX
@misc{aa_2026,
title = {aa},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/aa},
urldate = {2026-11-06}
}
